<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body style="height: 3000px;">
  <div id="app">
    <button @click="isShow = !isShow">
      {{ isShow? '隐藏': '显示' }}
    </button>
    <home-page v-if="isShow"></home-page>
  </div>
  <script src="./vue.js"></script>
  <script>
    const Home = {
      template: `
        <div>
          <h2>这是home页</h2>  
          
        </div>
      `,
      data() {
        return {
          timer: null
        }
      },
      mounted () {
        this.timer = setInterval(() => {
          console.log(111);
        }, 1000)
        window.onscroll = () => {
          console.log('222');
        }
      },
      beforeDestroy () {
        clearInterval(this.timer);
        window.onscroll = null;
      }
    }
    Vue.component('HomePage', Home)
    const vm = new Vue({
      el: '#app',
      data: {
        isShow: true
      }
    })
  </script>
</body>
</html>